2024 Mazda CX-90 engine problems

Filed Nov 9, 2026 · Engine · GA

Around 69,000 miles, radiator started leaking. This is a known issue with this vehicle due to failure of factory crimping machine. Multiple open lawsuits related to this failure. This is a major safety concern as the vehicle could overheat and catch fire or explode. No recalls issued, but more and more complaints and failures reported.

Filed Nov 5, 2026 · Engine · UT

Engine mounts allowed engine to move excessively, causing a cracked radiator.

Filed Oct 19, 2026 · Electrical, Engine · AL

While driving through a busy intersection with my family inside the vehicle, my 2024 Mazda CX-90 suddenly experienced a complete loss of propulsion. Pressing the accelerator pedal produced no response, leaving the vehicle unable to accelerate or maintain speed. The vehicle displayed warning messages stating “Engine malfunction” and “Stop safely and shift to Park.” I was forced to rely on the vehicle’s remaining momentum to coast out of the busy intersection and into a nearby gas station. This unexpected loss of propulsion created an extremely dangerous situation and placed my family at serious risk of a collision with surrounding traffic. Following the incident, the vehicle was taken to Hiley Mazda, where technicians diagnosed a failed 48-volt mild-hybrid battery and ordered a replacement under warranty. A leaking radiator was also discovered during the same service visit. This vehicle has an extensive history of electrical malfunctions, abnormal i-Stop operation, software-related issues, and previous safety concerns. However, this incident was particularly alarming because the vehicle completely lost propulsion while operating in active traffic. I am extremely concerned that this type of failure could occur in other Mazda CX-90 vehicles, potentially resulting in a serious accident or injury. I am requesting that the federal safety agency investigate this sudden loss-of-propulsion failure and determine whether it represents a broader safety defect affecting Mazda’s 48-volt mild-hybrid system.

Filed Oct 9, 2026 · Electrical, Engine · 46,464 miles · TN

The contact owns a 2024 Mazda CX-90. The contact stated that the vehicle was previously repaired by a dealer. While driving, the vehicle lost motive power. The contact turned off and restarted the vehicle. Additionally, the front passenger’s seat failed to move as needed. The vehicle was taken to the dealer, and it was determined that there was a radiator and battery case leak. The contact was informed that the vehicle was unsafe to drive and was provided a loaner vehicle. The dealer replaced the battery and the front passenger’s seat electric switch. The battery case and radiator needed to be replaced. The manufacturer was notified of the failure by email. The failure mileage was 46,464.

Filed Sep 7, 2026 · Engine · CA

Vehicle has 43,000 miles and the radiator has failed. Engine light goes off and on about high engine temperature and limits acceleration. Lost acceleration on freeway and was forced to get off on the freeway shoulder. The temperature gauge jumps from normal to high. Engine was extremely hot and potentially a burn hazard when I opened the hood. I've researched Mazda CX-90 owner's online forums and this radiator failure is happening to the 2024 model with several owners just out of warranty stating leaks spraying engine area. My vehicle has the same green coolant spray dried on the water hoses that many other owners have experienced.

Filed Aug 24, 2026 · Engine · FL

My vehicle experienced a total, premature radiator failure at 43,500 miles, after the manufacturer's factory warranty expired. The vehicle began leaking engine coolant rapidly. This creates a severe safety hazard, as a sudden loss of coolant leads to immediate engine overheating, potential engine stall, and catastrophic failure while driving at highway speeds, increasing the risk of a crash.A certified technician diagnosed the vehicle and provided video/photographic evidence confirming that the coolant leak is originating from a specific crack on the lower section of the driver's side radiator.This is a known, systemic manufacturing defect based on my research. Numerous other 2024 Mazda CX-90 owners on automotive forums have documented the exact same failure occurring in the exact same location on the lower driver-side radiator. The defect required a complete radiator replacement, forcing me to pay approximately $2,204 (with taxes and fees) out of pocket for a premature component failure that should safely last past 100,000 miles. I have digital photographic/video proof of the cracked unit from the service technician available for review.

Filed Aug 7, 2026 · Engine, Steering · NY

I leased that car Mazda cx-90 from Mazda of [XXX] [XXX] Since i got the car i had feeling the steering wheel its not normal, also the water its under normal level when i did the oil change and the maintenance i mentioned all the issues i have but they didn’t do anything till the last time when they did the oul change the inform me that i have to replace the steering wheel gear and the RADIATOR for $4000 they said its not under the coverage anymore over 36000 miles, and they didn’t say anything about what i have told them before ! INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Aug 5, 2026 · Electrical, Engine · NY

I am reporting a recurring safety-related issue with my 2024 Mazda CX-90 Turbo S Premium involving the mild hybrid system. The first failure occurred at approximately 28,000 miles. While driving, the vehicle displayed multiple warning messages, including "Mild Hybrid Battery Malfunction," "i-Stop Malfunction," and "Engine Malfunction." Shortly afterward, the vehicle entered a reduced-power (limp mode) condition. The loss of normal power made it difficult to safely accelerate and keep pace with surrounding traffic, creating a significant safety concern. The dealership diagnosed the vehicle and replaced the mild hybrid battery. My vehicle remained out of service for approximately one month while repairs were completed. At approximately 56,000–58,000 miles, the same problem occurred again. The vehicle once again displayed the "Mild Hybrid Battery Malfunction," "i-Stop Malfunction," and "Engine Malfunction" warning messages and again entered reduced-power mode while driving. The repeated loss of power created another serious safety concern because the vehicle could not accelerate normally when merging into traffic or driving on higher-speed roads. After diagnosing the second failure, the dealership informed me that, in addition to replacing the mild hybrid battery, corrosion had been found in the wiring harness and internal wiring associated with the hybrid battery system. Those components also required replacement. Due to parts availability, my vehicle remained at the dealership for an extended period before repairs could be completed. This vehicle has experienced the same hybrid system failure twice within approximately 58,000 miles, despite the first battery having already been replaced. I am concerned that this is a recurring defect affecting the mild hybrid electrical system. A failure that causes multiple system malfunction warnings and forces the vehicle into reduced-power mode while driving increases the risk of a crash, especially when merging onto highways

Filed Jul 23, 2026 · Engine · GA

At just under 40,000 miles, the radiator started leaking along the seams. It was noticed by the dealer repair shop when the dealer was performing warranty repairs on the front differential. There were no other indications before discovery.

Filed Jul 9, 2026 · Electrical, Engine · 29,000 miles · LA

The contact owns a 2024 Mazda CX-90. The contact stated that while operating the vehicle, several warning messages were displayed on the instrument panel, including the electronic stability control and the check engine warning lights. Later, while driving, the power steering failed, causing the steering wheel to become difficult to turn in either direction. The vehicle was driven to a local dealer, who was unable to determine the cause of the failures. The contact was informed that the battery would not remain charged. The manufacturer was not yet contacted. The failure mileage was 29,000.